help with 75 280 z auto trans.

[Fordlover]

Hi got my z running a while ago and had to park for a strut change. I also had been having to jump yellow wire on starter to crank. was running car down the street after strut change and it started missing and over heating and the alt was discharging. limped it home to see fan belt had turned to dust. I went to the store and got a new one and put on yet the car still ran like I had burnt it up.never pegged the temp in just got hot when the belt let. installed a jumper wire from starter to key switch so I wouldn't have to raise hood ever time i start it. I started trouble shooting car that evening and found # 6 was not pulling its share. I pulled spark plug and swaped no change. I pulled injector and changed and that was the problem so I pulled fuel rail and blew out all injectors reinstalled. changed metal filter on fire wall and it was full of rusty gas. pulled inline 10$ glass reuseable filter that I installed between tank and fuel pump. I also cleaned and sealed gas tank with por 15's product. car seemed to run fine after all that.

Then I went to tax(tag) office to re register car and ford truck as I had a birthday in early august, went to leave tag agency and car would not start. I t would crank, no spark and maybe no fuel pump. had to hear pump when car is cranking. I could jump fuel and get gas, I tried to hot wire coil and still got no spark. I had walked home 2 miles and got ford truck and car trailer, parked in lot down street from tag office. As a last resort I changed a relay,I had an extra bolted on rght fender well when working on car before. And the z cranked up and ran like a champ. Car ran for a day just fine then it started backfireing in the intake then day 2 won't start. That is 2 relays in 1 week. anybody had this problem with a 1975 datsun 280z Automatic transmission? I think the only thing I did was bypass the inhbitor switch and its relay with my jumper wire from key switch to yelow starter wire. here are some pictures of what I got. I would like to get this sorted out as I need to fix a/c and the defroster. the fan only blows out the vents no blow out defrost ducts etc. Whats killing these fuel pump relays? and what is this vaccum stuff? Thanks Stephen

[Fordlover]

In the firsdt picture are what I think are fuel pump relay and a fuel pump control relay. they are both the same down to color of wires, but what they pull into is different.IJ changed the lower one I think with another just like it I had from the junk yard. that would be the bottom one pllugged into the black,b/w,yellow and the y/b wires on body harness. the other relay plugs into a white,2green,a green/yellow strip on harness side. other pictures of this stuff I down't know whatd it is as its not in the FSM. thanks again for any help. Stephen

[Fordlover]

had problems with the car last week, Miss Z even left me walking, gave me pleanty of time to think about my Z and life in general. I couldn't get her to run till I changed a relay. Went shopping and couldn't find any replacement relays. Read on site or web about cleaning up old relays so I started working on one. come to find out that the short harness just plugs into the relay with a rubber boot on it. pryed cover loose and examimed points and coil that make up the relay. and they looked great. Gave Miss Z's relay the ole smell test and the relay didn't smell burnt. So I'm sitting at the pc reading any and everything I can when I had all I can stand so I went back outside and reinstalled the relay bracket on right fender well side of car. Installed battery and tried the key.Nothing. No click of any kind,I thought I had a dead battery. So I got the Monster group 24 out of the f_rd p/u and connected that up. Well turns out that the other battery wasn't dead. It was a loose fuseable link. I got to wiggling one of them and with the key on the new injectors started snapping. So I say to myself hell thats what that sounds like. OK thats a good way to test injectors! key on unconnect and connect the fuseable link. who could of thought? Pulled fuseable link part way off where it was making a good connection and that was the problem.Turned the key to start and Miss Z started right up. There gos my week of parting and typing on ebay.Now its down to figuring why I have a back fire at off Idle throttle. I usually just floor it and avoid that little stumble. I then procede to get 5$ of gas (High Test) in the tank and take Miss Z out for a little spanking for being such and agrovating Bitch! Oh yea Now to make the defoster get air! Later Gents!!!! ps thanks for the greatest Z site to rant and learn on! Stephen